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/**************************************************************************
* LPRng IFHP Filter
* Copyright 1994-1997 Patrick Powell, San Diego, CA <papowell@astart.com>
*
* Based on the CTI printer filters.
* See COPYRIGHT for details.
*
* do_monitor.c,v 3.3 1998/03/29 23:03:05 papowell Exp
*/
#include "portable.h"
#include "hp4.h"
#include "common.h"
/*
* set up the child process to do the monitoring and synchronizaiton
*/
void pr_ustatus(fd,pjlstr)
int fd;
char *pjlstr;
{
int i = 0;
query[i++]=pjlstr;
pr_query(fd, i);
}
void do_monitor()
{
int printer_code;
int n, err;
char buf[MAXLINE+1];
int i = 0;
header_info();
printer_ok = TRUE;
if( get_status ){
/*
* Try to synchronise with printer; use 60 secs as good default
*/
if( sync_printer ){
if( pr_synch(STDOUT, 60 )==FALSE ){
log(2,"Failed to synchronise with printer");
fexit(FILTRETRY);
}
/* send the start of job string */
i = 0;
plp_snprintf(buf,sizeof(buf)-1,"@PJL JOB %s\r\n", job_start);
query[i++] = buf;
log(4, "do_monitor: starting");
pr_query(STDOUT, i);
}
/*
* Check printer status
*/
if( infostatus ){
do {
printer_ok = FALSE;
printer_code = 0;
pr_ustatus(STDOUT, INFOSTATUS); /* job status on */
err = readpipe( &printer_code,4);
n = printer_code/1000; /* code group */
if( err < 0 ){
log (2, "EOF reading from printer");
fexit(FILTABORT);
} else if( err != 0
&& (n == 10 || n == 11 || printer_code == 35078 ) ){
/*
* These printer codes indicate that it is
* safe to print:
*
* 10xxx: Informational messages.
* 11xyy: Background Paper Mount (paper is out in some
* tray, but the same format is available in
* another tray).
* 35078: Entered powersave mode.
*/
printer_ok = TRUE;
}
} while( printer_ok==FALSE );
}
/* get initial page count */
if( pagecount ){
initialpagecount = pr_pagecount(STDOUT);
if( initialpagecount < 0 ){
log (2, "Pagecount not found using PJL INFO.");
}
}
if( (initialpagecount < 0 || forcepagecount) && cartridge ) {
initialpagecount = pr_pspagecount(STDOUT);
if (initialpagecount < 0){
log (2, "Pagecount not found using PostScript");
}
}
/* set up reading of status information */
if( infostatus ){
create_monitor();
log(4,"Father pid=%d, child %d",getpid(), monitpid );
}
}
log(2,"Initial page count %d", initialpagecount );
}
void create_monitor()
{
int n, pid;
/* pr_ustatus(STDOUT,"@PJL USTATUS DEVICE = VERBOSE\r\n"); */
monitpid = fork();
log(4,"Right after fork, pid %d with monitpid=%d",
getpid(), monitpid);
if( monitpid == -1 ){
logerr(1,"Cannot fork process");
fexit(FILTABORT);
} else if( monitpid == 0 ){
pid = getppid();
log(4,"Child with pid=%d, parent %d", getpid(), pid);
while(1){
fd_set readfds;
FD_ZERO( &readfds );
FD_SET( STDOUT, &readfds );
/* desperation check for parent exiting under
core dump type or where no killpg() done */
if( kill(pid,0) == -1 ){
exit(0);
}
log(4,"Child starting select");
n = select( STDOUT+1, &readfds, (void *)0, (void *)0,
(void *)0 );
log(4,"Child select returns %d", n);
if( n > 0 ){
log(4,"Child getting status");
n = readpipe((int *)0, 30 );
if( n < 0 ) break;
} else if( n == -1 && errno != EINTR ){
break;
}
}
log(4,"Exit child with pid=%d",getpid() );
exit(0);
}
}
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